Malicious PDF — malware analysis report

Static analysis result for SHA-256 7792195be5a1d8ad…

MALICIOUS

PDF

41.7 KB
MD5: 1918942746cddf8dd2ee0a6ddf9c13fa SHA-1: 0534e5eeb8e00064c82f2fa8f20bd1aefe76a79d SHA-256: 7792195be5a1d8ad6ea9218e8f107cde81b68ea23c0d204268312be1528e8388
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged as a critical exploit cluster associated with XFA forms. The JavaScript, though obfuscated, appears to be designed to execute code. This suggests the file is a malicious document intended to exploit a PDF vulnerability for initial execution, likely leading to a further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
16d09b99abfc3466d4e80ca914b4bf7d55b39aae267e2f6591b3f23e23a96e23		 pdf-javascript-stream PDF /JS object 12 at offset 0xA215 193 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var eva=new Function("a","ev       a     l        (a);".split(" ").join(""));
       var s='';
    var output = "";
		for (cv=0;cv<s.length;cv+=2) output += "%"+s[cv]+s[cv+1];

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